Soutenance de Thèse de Doctorat en “Optique et Photonique” par Mr. Paul Stone MACHESO

The Euromed University of Fes (UEMF) is pleased to inform the public of

The doctoral thesis defense in “Optique and Photonics”

The thesis defense will take place on September 15, 2025 at 3 p.m. at l’UEMF

Location: L’Incubateur (LOC 001994)

The thesis will be presented by Mr. Mr. Paul Stone MACHESO

under the topic :

“ Design of Optical Fiber Sensors Using the Fiber Bragg Grating Technique for the Fourth Industrial Revolution ”

Abstract

Fiber bragg grating (FBG)-based sensing technology has become a game-changing solution in a variety of industrial, military, aerospace, and civil engineering applications. Because of their tiny size, ability to sense in several locations, and tolerance to electromagnetic interference, FBG sensors are highly prized and perfect for settings where conventional sensors are not as effective. This study investigates the use of FBG-based sensors for vital physical parameters, especially in harsh and dynamic settings, like strain, temperature, and pressure. FBG sensors integrated into a single optical fiber provide notable benefits in terms of system scalability, cost-effectiveness, and simplicity, especially for large-scale constructions. By optimizing sensor design in Finite Difference Time Domain (FDTD), improving strain and temperature sensing, and investigating their potential in smart factories and Internet of Things applications, this work advances FBG sensor technology and eventually pushes the limits of sensor performance in next-generation industrial systems the Fourth Industrial Revolution and beyond. Furthermore, a comparison of the performance of single-mode and multimode fiber Bragg grating sensors (MMFBG) for temperature monitoring and to improve the knowledge of how the grating's geometrical characteristics affect the transmission spectrum of these sensors. Additionally, in order to improve the sensitivity of MMFBG sensors and make them more appropriate for temperature sensing applications, we suggest a unique design that combines phase-shifted and tilted grating.

Keywords : Finite Difference Time Domain, Temperature, Strain, Fiber Bragg Grating, Sensor, Wavelength , Industrial 4.0

This thesis will be presented to the jury members: